Highest BC for up to 109 gr bullet

[SteveOak]

What bullet in the 105 to 108 gr class, has the highest BC?

I am willing to give up slight differences in accuracy to gain an appreciable amount of BC. By appreciable amount of BC I mean .020 or more.

The barrel is 8 twist chambered for a 6 BR so I prefer not to use 115 gr class bullets.

Thanks

 

[dmoran]

There pretty much all with in a 1/2-point or less of each other, with minimal difference in ballistics potential.
Close enough that the one that has the best accuracy in a given barrel, will have the ballistic advantage - IME
Donovan

 

[MarkS]

What bullet in the 105 to 108 gr class, has the highest BC?

I am willing to give up slight differences in accuracy to gain an appreciable amount of BC. By appreciable amount of BC I mean .020 or more.

The barrel is 8 twist chambered for a 6 BR so I prefer not to use 115 gr class bullets.

Thanks

Steve,

The 105gr VLD is 0.517 the 108gr BT is 0.522. The 105 Hybird is 0.536, but it calls for a 7 tw barrel.
Go for accuracy all cases! BC is not going to do much for you, if it is not accurate.

Mark Schronce

 

[DanSavage]

I like the Hornady 105 BTHP with a B.C. of .530. Really accurate and cheap. They are quite different than most 105 class bullets though with the Hornady's having a long bearing surface. The bearing surface protrudes in the case past the neck with my load but it doesn't seem to care. I have shot 20 at a match that all went into the bull with 14 X's at 500 yards on official F-class target, the first 20 at the match were to the left and was getting a 2'' group,, that's what happens when there is no pits and you can't see your bullet holes in the black target.

 

[SteveOak]

Steve,

The 105gr VLD is 0.517 the 108gr BT is 0.522. The 105 Hybird is 0.536, but it calls for a 7 tw barrel.
Go for accuracy all cases! BC is not going to do much for you, if it is not accurate.

Mark Schronce

In my post I said that I am willing give up "slight differences in accuracy". Not sure how you came to "not accurate."

If one is chasing the ultimate accuracy with a 6 BR they're not going to be shooting 100 gr + bullets anyway.

The importance of .2" of group depends on what you shoot.

I will shoot these out to 385 meters, standing! 3 or 4 inches less wind deflection at 385 meters means a whole lot more than a .2" improvement in group.

 

[dmoran]

The majority of the 105 to 108-gr class bullets will have BC values between .500 to .550-BC.
Ballistic's to a 10-mph wind is less then 1.5" wind-drift at 385-meters between that coefficient range.

My experience, raw accuracy will trump those amounts of BC variation.
The most accurate bullet will yield less vertical and horizontal dispersion is why.
Donovan

 

[dkhunt14]

I agree with Donovan and accuracy trumps all else. Almost every 600 yard and 1000 yard guy uses the 105 to 108 class bullets. I don't think at 385 meters you will see much difference. I can't hardly see it at 1000 with a dasher. Matt

 

[Mozella]

I agree with Donovan and accuracy trumps all else. Almost every 600 yard and 1000 yard guy uses the 105 to 108 class bullets. I don't think at 385 meters you will see much difference. I can't hardly see it at 1000 with a dasher. Matt

Of course accuracy can never be discounted, but it's not the be-all end-all. I shoot 600 yd F-Class at a particularly tricky range where wind is often above 10 mph, almost never steady, and frequently swirling with flags blowing in opposite directions. I don't shoot my most accurate recipe in competition either with my 6mm BR Norma or my .223 F/TR.

I'm willing to give up a LITTLE no-wind accuracy in return for higher BC and/or higher muzzle velocity, both of which are important and become more important as the wind gets harder to read. So coping with tricky winds, especially since I'm not very good at reading wind, makes me take a slightly different approach to my competition recipe than someone who shoots at a range with low or steady winds or someone who can read wind better than I.

It takes a bit of study, but anyone with good testing records and a ballistics program can, in theory, fine tune their recipe. I chronograph every test round, scan/measure each test target, and compile all the data into an Excel spread sheet so that I can keep track of what's what. You can't do this properly if you measure group size with a carpenter's tape and keep records in a paper notebook.

It seems to work for me. Last weekend I won F/TR with a score higher than any of the F-Open shooters. The next day I won the 600yd BR match with best score and smallest group.

Bottom line: MV, BC, and accuracy are all important to one degree or another, but to say which one is the most important depends on the situation. You gotta' analyze your equipment, performance, range conditions, and never forget your lucky underwear.

 

[dmoran]

Mozella -
So your saying the bullet you used to win that F/TR and BR match is not the most accurate bullet in that barrel?

My experience is, raw accuracy has the ballistic advantage, by having less dispersion built in.
Donovan

 

[SteveOak]

Thanks to DanSavage for actually answering the question.

Honorable mention to MarkS. You forgot to mention who makes the bullets you listed.

Also, please tell me who makes these horrifically inaccurate high BC bullets so that I can avoid them.

 

[expiper]

wow,,,If he had used his good bullets he would have scored even better,,,,that is like saying I used my second best rifle,,,you benchrest shooters (me included ,,haha) need to remember that the bullseye in F-class is as big as a washtub,,,just sayin,,,Roger
OK OK,,,small washtub,,,!!--and ,,could it be knowing where to put the crosshairs helps a lot with keeping them together and in the middle !!!

 

[DanSavage]

My experience is, raw accuracy has the ballistic advantage, by having less dispersion built in.
Donovan

Yes! Just test the different 105 style bullet's and see which one shoot's the tightest consistently in your barrel. Like said there isn't going to be hardly any difference in drift due to the minute B.C. difference's.

 

[savagedasher]

Simple test and you can see the results in real time. Shoot a steel plate at 1000 yards. The vertical difference is bc. My 105 Hybrids hit 15 " high compared to SMK Larry

 

[SteveOak]

Simple test and you can see the results in real time. Shoot a steel plate at 1000 yards. The vertical difference is bc. My 105 Hybrids hit 15 " high compared to SMK Larry

What bullets are these?

 

[expiper]

also,,,were the MV's the same and were each loads sighted in at 100 yds to beging with,,,,just because a bullet hits lower than some other load doesnt necessarily mean it is slower or less BC,,,,at 100 yds some shoot an inch different if you dont change the scope,,,you can put a 70-80-90 gr. bullet in with the same scope setting at 100 yds and at 600-1000,and it may hit higher but that doesnt mean the BC is better,,,the BC's are not THAT dif,,,Roger

 

[savagedasher]

also,,,were the MV's the same and were each loads sighted in at 100 yds to beging with,,,,just because a bullet hits lower than some other load doesnt necessarily mean it is slower or less BC,,,,at 100 yds some shoot an inch different if you dont change the scope,,,the BC's are not THAT dif,,,Roger

I check mine sighted in at 1000 and both shooting good at 100. Larry

 

[dmoran]

SteveOak -
If your really after ballistic supremacy solely, you should consider a bigger 6 (or even a different caliber).
The 6BR is an accuracy designed cartridge, not a velocity/ballistic design. 243-Ackley, 6mm-Ackley, 6-06, etc.. would give you ballistic supremacy over the 6BR, by large gains to velocity potential.

I know of no bullets in the 105 - 108 class that have a ballistic advantage worth more then about 1-MOA across the whole range of them.
Pointing bullets can gain you a few percent and something you may want to consider.
Good Luck
Donovan

 

[dmoran]

Simple test and you can see the results in real time. Shoot a steel plate at 1000 yards. The vertical difference is bc. My 105 Hybrids hit 15 " high compared to SMK Larry

I check mine sighted in at 1000 and both shooting good at 100. Larry

If there both sighted in (zero'd) at 1000, how can there be 15" difference?
Sounds to me like your using ones 1000yd zero to compare the next, which is fubar....
You have to Zero each bullet individually, and account for any velocity indifference, to ballistically compare by drop bullets BC values.

 

[SteveOak]

SteveOak -
If your really after ballistic supremacy solely, you should consider a bigger 6 (or even a different caliber).
The 6BR is an accuracy designed cartridge, not a velocity/ballistic design. 243-Ackley, 6mm-Ackley, 6-06, etc.. would give you ballistic supremacy over the 6BR, by large gains to velocity potential.

I know of no bullets in the 105 - 108 class that have a ballistic advantage worth more then about 1-MOA across the whole range of them.
Pointing bullets can gain you a few percent and something you may want to consider.
Good Luck
Donovan

I'm not but thank you.

I am looking for least wind resistance as expressed by highest BC in a less than 109 gr, 6mm bullet for a 6 BR.

 

[savagedasher]

If there both sighted in (zero'd) at 1000, how can there be 15" difference?
Sounds to me like your using ones 1000yd zero to compare the next, which is fubar....
You have to Zero each bullet individually, and account for any velocity indifference, to ballistically compare by drop bullets BC values.

Here you go again no place did I say they both were ZERO'D. at 1000 Larry